Loading...
1/*
2 * alloc.h - persistent object (dat entry/disk inode) allocator/deallocator
3 *
4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * Originally written by Koji Sato.
17 * Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji.
18 */
19
20#ifndef _NILFS_ALLOC_H
21#define _NILFS_ALLOC_H
22
23#include <linux/types.h>
24#include <linux/buffer_head.h>
25#include <linux/fs.h>
26
27/**
28 * nilfs_palloc_entries_per_group - get the number of entries per group
29 * @inode: inode of metadata file using this allocator
30 *
31 * The number of entries per group is defined by the number of bits
32 * that a bitmap block can maintain.
33 */
34static inline unsigned long
35nilfs_palloc_entries_per_group(const struct inode *inode)
36{
37 return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);
38}
39
40int nilfs_palloc_init_blockgroup(struct inode *, unsigned int);
41int nilfs_palloc_get_entry_block(struct inode *, __u64, int,
42 struct buffer_head **);
43void *nilfs_palloc_block_get_entry(const struct inode *, __u64,
44 const struct buffer_head *, void *);
45
46int nilfs_palloc_count_max_entries(struct inode *, u64, u64 *);
47
48/**
49 * nilfs_palloc_req - persistent allocator request and reply
50 * @pr_entry_nr: entry number (vblocknr or inode number)
51 * @pr_desc_bh: buffer head of the buffer containing block group descriptors
52 * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap
53 * @pr_entry_bh: buffer head of the buffer containing translation entries
54 */
55struct nilfs_palloc_req {
56 __u64 pr_entry_nr;
57 struct buffer_head *pr_desc_bh;
58 struct buffer_head *pr_bitmap_bh;
59 struct buffer_head *pr_entry_bh;
60};
61
62int nilfs_palloc_prepare_alloc_entry(struct inode *,
63 struct nilfs_palloc_req *);
64void nilfs_palloc_commit_alloc_entry(struct inode *,
65 struct nilfs_palloc_req *);
66void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *);
67void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *);
68int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *);
69void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *);
70int nilfs_palloc_freev(struct inode *, __u64 *, size_t);
71
72#define nilfs_set_bit_atomic ext2_set_bit_atomic
73#define nilfs_clear_bit_atomic ext2_clear_bit_atomic
74#define nilfs_find_next_zero_bit find_next_zero_bit_le
75#define nilfs_find_next_bit find_next_bit_le
76
77/**
78 * struct nilfs_bh_assoc - block offset and buffer head association
79 * @blkoff: block offset
80 * @bh: buffer head
81 */
82struct nilfs_bh_assoc {
83 unsigned long blkoff;
84 struct buffer_head *bh;
85};
86
87/**
88 * struct nilfs_palloc_cache - persistent object allocator cache
89 * @lock: cache protecting lock
90 * @prev_desc: blockgroup descriptors cache
91 * @prev_bitmap: blockgroup bitmap cache
92 * @prev_entry: translation entries cache
93 */
94struct nilfs_palloc_cache {
95 spinlock_t lock;
96 struct nilfs_bh_assoc prev_desc;
97 struct nilfs_bh_assoc prev_bitmap;
98 struct nilfs_bh_assoc prev_entry;
99};
100
101void nilfs_palloc_setup_cache(struct inode *inode,
102 struct nilfs_palloc_cache *cache);
103void nilfs_palloc_clear_cache(struct inode *inode);
104void nilfs_palloc_destroy_cache(struct inode *inode);
105
106#endif /* _NILFS_ALLOC_H */
1/*
2 * alloc.h - persistent object (dat entry/disk inode) allocator/deallocator
3 *
4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Original code was written by Koji Sato <koji@osrg.net>.
21 * Two allocators were unified by Ryusuke Konishi <ryusuke@osrg.net>,
22 * Amagai Yoshiji <amagai@osrg.net>.
23 */
24
25#ifndef _NILFS_ALLOC_H
26#define _NILFS_ALLOC_H
27
28#include <linux/types.h>
29#include <linux/buffer_head.h>
30#include <linux/fs.h>
31
32/**
33 * nilfs_palloc_entries_per_group - get the number of entries per group
34 * @inode: inode of metadata file using this allocator
35 *
36 * The number of entries per group is defined by the number of bits
37 * that a bitmap block can maintain.
38 */
39static inline unsigned long
40nilfs_palloc_entries_per_group(const struct inode *inode)
41{
42 return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);
43}
44
45int nilfs_palloc_init_blockgroup(struct inode *, unsigned);
46int nilfs_palloc_get_entry_block(struct inode *, __u64, int,
47 struct buffer_head **);
48void *nilfs_palloc_block_get_entry(const struct inode *, __u64,
49 const struct buffer_head *, void *);
50
51int nilfs_palloc_count_max_entries(struct inode *, u64, u64 *);
52
53/**
54 * nilfs_palloc_req - persistent allocator request and reply
55 * @pr_entry_nr: entry number (vblocknr or inode number)
56 * @pr_desc_bh: buffer head of the buffer containing block group descriptors
57 * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap
58 * @pr_entry_bh: buffer head of the buffer containing translation entries
59 */
60struct nilfs_palloc_req {
61 __u64 pr_entry_nr;
62 struct buffer_head *pr_desc_bh;
63 struct buffer_head *pr_bitmap_bh;
64 struct buffer_head *pr_entry_bh;
65};
66
67int nilfs_palloc_prepare_alloc_entry(struct inode *,
68 struct nilfs_palloc_req *);
69void nilfs_palloc_commit_alloc_entry(struct inode *,
70 struct nilfs_palloc_req *);
71void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *);
72void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *);
73int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *);
74void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *);
75int nilfs_palloc_freev(struct inode *, __u64 *, size_t);
76
77#define nilfs_set_bit_atomic ext2_set_bit_atomic
78#define nilfs_clear_bit_atomic ext2_clear_bit_atomic
79#define nilfs_find_next_zero_bit find_next_zero_bit_le
80
81/**
82 * struct nilfs_bh_assoc - block offset and buffer head association
83 * @blkoff: block offset
84 * @bh: buffer head
85 */
86struct nilfs_bh_assoc {
87 unsigned long blkoff;
88 struct buffer_head *bh;
89};
90
91/**
92 * struct nilfs_palloc_cache - persistent object allocator cache
93 * @lock: cache protecting lock
94 * @prev_desc: blockgroup descriptors cache
95 * @prev_bitmap: blockgroup bitmap cache
96 * @prev_entry: translation entries cache
97 */
98struct nilfs_palloc_cache {
99 spinlock_t lock;
100 struct nilfs_bh_assoc prev_desc;
101 struct nilfs_bh_assoc prev_bitmap;
102 struct nilfs_bh_assoc prev_entry;
103};
104
105void nilfs_palloc_setup_cache(struct inode *inode,
106 struct nilfs_palloc_cache *cache);
107void nilfs_palloc_clear_cache(struct inode *inode);
108void nilfs_palloc_destroy_cache(struct inode *inode);
109
110#endif /* _NILFS_ALLOC_H */